APA
(2003). Theoretical Manual for Enviornmental Valuation in Sri Lanka. Colombo,Srilanka: Ministry of Enviornment and Natural Resources.
Chicago
2003. Theoretical Manual for Enviornmental Valuation in Sri Lanka. Colombo,Srilanka: Ministry of Enviornment and Natural Resources.
Harvard
(2003). Theoretical Manual for Enviornmental Valuation in Sri Lanka. Colombo,Srilanka: Ministry of Enviornment and Natural Resources.
MLA
Theoretical Manual for Enviornmental Valuation in Sri Lanka. Colombo,Srilanka: Ministry of Enviornment and Natural Resources. 2003.